Comments on: JavaScript: String trimming and padding

By: Jesse Bethke

Jesse Bethke — Mon, 09 May 2011 16:14:28 +0000

I love that you solve this by prototyping the String object. Very elegant solution.

By: Clarence Fredericks

Clarence Fredericks — Mon, 07 Feb 2011 16:56:41 +0000

I just came across a nice, customizable JavaScript library called jPaq which allows you to download just these functions into a minified JS file. Here is the link to the download page: http://jpaq.org/download/1.0.0.00003

By: fijiwebdesign

fijiwebdesign — Mon, 08 Mar 2010 18:51:01 +0000

With padding strings, it would probably be better to create an array of the length of the padding, and do Array.join() with the padding as the parameter. The reason is that arrays are mutable and thus would be able to join large strings very quickly, while a loop that mutates a string on every iteration would be significantly slower. This won’t be apparent for small strings, but will be significant for larger paddings.

By: fijiwebdesign

fijiwebdesign — Mon, 08 Mar 2010 18:44:53 +0000

You may want to trim other characters as well:

String.prototype.trim = function(c) {
c = (c || “\s”);
return this.replace(new RegExp(“^["+c+"]+|["+c+"]+$”, “g”),”");
};

Eg:

” test\n”.trim(“\\s\\n”); // trim spaces and line breaks

By: Arafat Rahman

Arafat Rahman — Fri, 31 Oct 2008 16:27:11 +0000

JavaScript doesn’t support trim on strings. It is very easy to implement with regular expressions.
Thanks for the sharing.